m.2 pci-e

It's been a while since I built a system, and I just assumed I would be able to use a 64G partition on a SSD to accelerate a large mechanical SATA drive like I used to. The SSD is setup as a M.2 PCI-E device in slot 1 and the BIOS is configured to use RAID rather than AHCI. Windows 10 is booting...